Photoemission measurements of transition-metal oxides under laser illumination

J. W. Quilty, J. Y. Son, Takashi Mizokawa, D. Asakura, N. Motoyama, S. Uchida, T. Kimura, Y. Tokura

Research output: Contribution to journalArticle

Abstract

The effects of photoexcitation on Sr14-xCaxCu 24O41 and La2-2xSr1+2xMn 2O7 single crystals were measured via X-ray photoemission spectroscopy. Changes observed in the Sr14-xCaxCu 24O41 Cu 2p core-level line shape indicate that the cleaved surface is surprisingly unstable under vacuum and that changes in the surface stoichiometry are easily obtained with laser ablation. In La 2-2xSr1+2xMn2O7, the O 1s core-level peak binding energy irreversibly increases upon optical excitation. The magnitude of the increase depends on the sample hole doping and is observed to be largest in a x=0.5 sample, where phase competition between electronic ordered states is strongest. It appears that the photoinduced electronic structural change is permanent due to stabilization by strong electron-lattice coupling.

Original languageEnglish
Pages (from-to)909-912
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume144-147
DOIs
Publication statusPublished - 2005 Jun
Externally publishedYes

Fingerprint

Core levels
Photoexcitation
Photoemission
Oxides
Transition metals
metal oxides
photoelectric emission
Lighting
transition metals
illumination
Lasers
Electronic states
Laser ablation
Photoelectron spectroscopy
X ray spectroscopy
Binding energy
photoexcitation
electronics
Stoichiometry
laser ablation

Keywords

  • LaSrMn O
  • Photoexcitation
  • SrCaCu O
  • X-ray photoemission

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Photoemission measurements of transition-metal oxides under laser illumination. / Quilty, J. W.; Son, J. Y.; Mizokawa, Takashi; Asakura, D.; Motoyama, N.; Uchida, S.; Kimura, T.; Tokura, Y.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 144-147, 06.2005, p. 909-912.

Research output: Contribution to journalArticle

Quilty, J. W. ; Son, J. Y. ; Mizokawa, Takashi ; Asakura, D. ; Motoyama, N. ; Uchida, S. ; Kimura, T. ; Tokura, Y. / Photoemission measurements of transition-metal oxides under laser illumination. In: Journal of Electron Spectroscopy and Related Phenomena. 2005 ; Vol. 144-147. pp. 909-912.
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AU - Mizokawa, Takashi

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AU - Uchida, S.

AU - Kimura, T.

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AB - The effects of photoexcitation on Sr14-xCaxCu 24O41 and La2-2xSr1+2xMn 2O7 single crystals were measured via X-ray photoemission spectroscopy. Changes observed in the Sr14-xCaxCu 24O41 Cu 2p core-level line shape indicate that the cleaved surface is surprisingly unstable under vacuum and that changes in the surface stoichiometry are easily obtained with laser ablation. In La 2-2xSr1+2xMn2O7, the O 1s core-level peak binding energy irreversibly increases upon optical excitation. The magnitude of the increase depends on the sample hole doping and is observed to be largest in a x=0.5 sample, where phase competition between electronic ordered states is strongest. It appears that the photoinduced electronic structural change is permanent due to stabilization by strong electron-lattice coupling.

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